Novel platinum-alumina reforming catalysts

Abstract

A reforming catalyst comprised of 0.01 to 5 wt. % Pt, alumina, and a modifier comprised of about 100 to 500 wppm Si and at least 10 wppm of one or more alkaline-earth metal selected from Ca, Mg, Ba, and Sr wherein the total amount of modifier does not exceed about 5,000 wppm.

What is claimed is: 
     
       1. A catalyst composition for reforming naphthas, which composition is comprised of 0.01 to 2 wt. % platinum, alumina, and a modifier comprised of about 100 to 500 wppm of Si and at least 10 wppm of one or more alkaline earth metals selected from the group consisting of Ca, Mg, Ba, and Sr, wherein the total amount of modifier does not exceed about 5000 wppm. 
     
     
       2. The catalyst of claim 1 wherein about 0.1 to 0.7 wt. % platinum is present and the modifier is comprised of about 100 to 200 wppm of Si and about 100 to 3000 wppm of one or more alkaline earth metals. 
     
     
       3. The catalyst of claim 2 wherein about 0.1 to 0.7 wt. % platinum and the modifier is comprised of about 100 to 200 wppm Si and about 200 to 1000 wppm of an alkaline earth metal selected from Ca and Mg, and the alumina is gamma alumina. 
     
     
       4. The catalyst of claim 1 wherein about 0.1 to 3.5 wt. % halogen is also present. 
     
     
       5. The catalyst of claim 4 wherein about 0.5 to 1.5 wt. % halogen is present, the concentration of platinum is about 0.1 to 0.7 wt. %, and the modifier is comprised of about 100 to 200 wppm Si and about 100 to 3000 wppm of an alkaline earth metal selected from Ca and Mg.